Kappa Cannoneer (R 270 MH3)

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.)
Ward {4}
Whenever Kappa Cannoneer or another artifact you control enters, put a +1/+1 counter on Kappa Cannoneer and it can't be blocked this turn.

rare
Artifact Creature — Turtle Warrior
From the Magic: The Gathering set Modern Horizons 3.